COMBUSTION DEVICE

PURPOSE:To provide a stable combustion by a method wherein each of a thin flame burner and a thick flame burner is provided with an opening hole, a passage is arranged between a case and a burner end and thick gas is leaked. CONSTITUTION:Lean mixture gas generated at a thin mixture gas chamber 6 at a central part during combustion is flowed from an opening hole of a thin flame burner 3 so as to form a thin flame on a thin flame side flame hole. Thick mixture gas generated at thick mixture chambers 7 at both ends flows from the opening hole of the thick flame burner 4 so as to form the thick flame on the thick flame so as to hold alternative adjoining thin flames from each other. In addition, the thick mixture gas within the thick mixture gas chamber 7 is flowed into a passage 17 between the ends of the burners 3, 4 and a case 2 so as to form the thick flame on the upper part of the passage 17 with the leaked thick gas. With such an arrangement as above, since flame is formed in such a way that the thick flame encloses the thin flame, a thin flame holding becomes superior and then the combustion can be stabilized.